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I know I sound completely insane by talking about this, but I have the most regular periods, on the dot every month, I believe I counted one year and had a 30/31 day cycle, that was about 3 years ago when I counted but usually if I get my period one month I know it'll be there the next around the same date but a day earlier. Anyways, my LMP was Dec 22 roundish, my periods last about 6-7 days. I slept at my friends house dec 26/27 and am 99.999% sure him and I did not sleep together due to the fact that I had my period and remember sleeping in black shorts b/c I didn't want to bleed in his bed never mind clothing! We were drinking but I can honestly say we didn't have s_x. Anyways. January 6-7 I slept with my best friend a few times and know he came inside me. I was supposed to get my period on Jan 21 but I was late this month, never got it, I have never missed a period in my life of having them, took a pregnancy test around jan 26-28 and every single one was +. Well my due date is october 1st, i am 13 weeks 4 days pregnant. Every US I have had, my 6 week, 9 week and 12 week all date back to the day of conception being january 7th. I just am going crazy and doubting myself for some odd reason when I know point blank that my best friend is the father and conception was jan 7. Please give me some peace of mind.....crazy female!